[fix bug 925256] Clean EXIF data only when new image.
Merge pull request #661 from glogiotatidis/925256

[fix bug 925256] Clean EXIF data only when new image.
Some updates to the virtualenv install instructions

* Update some paths
* Will need mysql-dev to build mysql-python
* Workaround for migrations not working from scratch
* Allow people to keep their virtualenvs whereever they usually do.
  (Using $VIRTUAL_ENV in the commands is a little wordier, but people
  will probably be copying and pasting the commands from this page
  anyway.)
* BrowserID is now Persona.
* The shell command `source` is non-standard, and some very
  standards-compliant shells don't have it. `.` should work anywhere.
[Fix Bug 925428] Left justify bio text.
Merge pull request #664 from juliaelman/925428-left-justify-bio

[Fix Bug 925428] Left justify bio text.
Merge pull request #663 from dpoirier/doc-tweaks

Some updates to the virtualenv install instructions
[fix bug 908667] Add pagination in country listing pages.

*PEP8 beautifications.